Machine for the extrusion of plastic masses, such as rubber



AJune 2, 1942.` B. HANssoN.

l MACHINE FOR THE EXTRUSION OF PLASTIC MASSES, SUCH AS RUBBER Fi1ed Jan. 11, 1959 EPO!" om SSO n E Q15 Patented June 2, 1942 are gained by this which will from the following description given with refer-- tical extrusion-mechanism s PATE NT Y OFFICE MACHI E FOR THEEXTRUSION PLASTIC MASSES, SUCH AS RUBBER Vasteras, Sweden,

a corporation of Sweden Application January 11, maaserial No.

In Great Britain February 24, 1938 l -2 Claims.

The present invention relates to machines, for the manufacture of articles of plastic masses, such as rubber, articial resins and thelike by means of extrusion. These machines generally consist of a motor driven extrusion mechanism, the main part of which is a screw pressingout the plastic mass through a nozzle or die of suitable shape. A reduction gear ls generally arranged between the motor and the extrusion mechanism in order to reduce the motor speed to a speed suitable for the extrusion. In the constructions hitherto known the extrusion mechanism is horizontally mounted. This necessitates the mounting of theI whole mechanism and also the motor and gearcasing on a high bed plate ln order to obtain a suitable working height for the extrusion. The present invention has for its object to simplify. this arrangement by using the gear casing as the bed plate for the vertically mounted extrusion mechanism. Considerable advantages appear more clearly ence to the accompanying drawing which shows in iront viewan extrusion machine having a design according to the invention, but the invention is not restricted to this particular design.

The drawing shows the extrusion mechanism l and the electrical motor 3-with vertical shafts and mounted on the gear casing 2 which serves as a bed plate. A-control board 9 for the motor is also mountedon the gear casing. Underneath the inlet opening 6 for the plastic paste the veris braced to the motor by means of a plate l serving as a work-table, which prevents the plastic paste, for instance unvulcanized rubber, falling down on to the door and protects it from dust, sand and other impurities which result in faults in the extrudedl articles. The upper part of the extrusion mechanism is shown in section and shows the screw li and the nozzle l which is horizontally directed.

An important feature oi the invention is the great saving in space obtained. 'JIhe drawing shows in dash and dot lines two further extrusion mechanisms i2, i3 mounted on a common gear casing with the extrusion mechanismA l and driven by the same motor 3, the wholeoccupying a space no larger than that of the usual arrangement of one extrusion machine. The placing of threerubber extrusion mechanisms side by side in the manner shown and braced by a common work-table 4plate l0 facilitates to a very high degree the applying of rubber coatings to electric wir The rubber is prepared nisms, of which one, I2, applies a first coatingi means and by the working fluid which is kept l concentrated masses such las rubber tensive with said tube to form a by heating and kneading'n the first mechanism Ig from which it is extruded in twostrings to the inlet openings of the other extrusion mechaand the other, I3, applies a second coating to the electric wire, passing through the die heads of the same. A suitable working height both for the inlet of the rubber and the outlet of the extruded article is obtained without the use of heavy bed plates.

A further great;- importance of the invention is, however, that it ,can most advantageously be adapted to an effective temperature control system in which the plastic mass is cooled by a at its boiling temperature by means of the friction work. 4By this means an even and most suitable temperature distribution is obtained in the extrusion mechanism. The simplicity ol? this temperature control system in connection with the invention will appear from the upper, sectioned part of the extrusion mechanism' l. The space between the screw-containing tube and the outer shell of the extrusion mechanism is illled with water which may 'be poured in from time to time or continuously supplied in order to replace evaporated water. The Water is heated partly by a regulatable electric heating element I 4 placed at the bottom of the water-containing space, and partly by the.

friction work in the plastic masses kneaded by the screw Il.

By this arrangement the heat is in the upper quired and where it can be applied without the risk of vulcanizing the extruded rubber article.

I claim as my invention:

1. A machine for the extrusion of plastic comprisingl a vertically disposed extrusion tube having an in1et"adjacent its lower end and an extrusion outlet adjacent its upper end, a shell surrounding and coexchamber therebetween adapted to contain a fluid, and means disposed adjacent the lower end of said champart of the extrusion i mechanism where the highest temperature is reber for heating the iluid contained in said chamber whereby such iiuid is heated by said heating BROR HANSSQN.

' chamber. 

